After numerous unsuccessful attempts which included disabling my firewall, I decided to try decreasing the size of my 8453-PE. My original pdf was 16 MB; I reduced the size to 3.9 mb, and my transmission went. My firewall was also disabled during this last (sucessful) attempt, but, as I mentioned before, it had been disabled for all the other attempts. I think reducing the size of the pdf is what made this last attempt successful.
